JP2001011402A - Plasma display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display having a heat radiant, pressure-sensitive adhesive sheet which sheet does not permit an air to enter between the adhesive layer surfaces thereof and both a panel and a heat radiant plate each stuck thereto, even if the air has entered therebetween, which sheet can easily exhaust the air. SOLUTION: A plasma display sheet is provided with a panel 11, a heat radiant plate 12 and a heat radiant, pressure-sensitive adhesive sheet S which lies between the panel 11 and the heat radiant plate 12. And this heat radiant sheet S is a sheet which is formed by solidifying a heat radiant, pressure- sensitive adhesive composition containing a pressure-sensitive adhesive and a heat conduction-imparting agent and which has the front and back surfaces formed into pressure-sensitive adhesive surfaces, on which front surface streaky grooves are long formed to the same direction and at the equal intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display used for a flat panel receiver (wall-mounted television) or the like.

[0002]

2. Description of the Related Art A plasma display panel generates ultraviolet rays by electric discharge and irradiates the ultraviolet rays to a phosphor to emit light. Therefore, a system that can remove the heat generated by the discharge is required. In particular, if an attempt is made to ensure high brightness to achieve high resolution, the amount of heat generated is large. Therefore, as shown in FIG. A heat radiating plate 12 is provided via a sheet (heat radiating adhesive sheet) 50 to dissipate the heat of the entire panel 11 and to make the temperature of the entire surface uniform.

Conventionally, the heat-dissipating pressure-sensitive adhesive sheet 50 has been prepared by uniformly dispersing a heat-conductivity imparting agent in a liquid pressure-sensitive adhesive and applying the heat-conductivity imparting agent to the surface of a separator to obtain a uniform dispersion state of the heat-conductivity imparting agent. What is solidified (solidified) by heating while keeping as much as possible is used. That is, the heat-dissipating pressure-sensitive adhesive sheet 50 is a pressure-sensitive adhesive surface on which both sides can be adhered by peeling off the separator,
It is a roll-shaped winding body continuously wound on a winding drum together with a separator.

[0004] When the heat-radiating pressure-sensitive adhesive sheet 50 is provided between the back surface of the panel 11 and the heat-radiating plate 12, the following is performed. That is, first, the heat-radiating pressure-sensitive adhesive sheet 5 with a belt-like separator from the above-mentioned wound body is used.
0 is fed out and cut into a required shape. And FIG.
As shown in FIG. 7, the heat-radiating adhesive sheet 50 is warped by making the adhesive surface with the separator concave, and the end portion of the heat-radiating adhesive sheet 50 is prevented from entering air between the heat-radiating plate 12 and the adhesive surface without the separator. Then, the heat-dissipating pressure-sensitive adhesive sheet 50 with a separator is stuck so as to gradually follow the heat-dissipating plate 12. Then, the heat-radiating pressure-sensitive adhesive sheet 50 is pressed from above the separator with a pressing roll or a hand and the air is released, so that the heat-radiating pressure-sensitive adhesive sheet 50 and the heat radiating plate 12 are completely adhered to each other. Next, the separator is peeled off, the other adhesive surface is adhered to the back surface of the panel 11 and pressed from above the heat sink 12. Thus, the heat radiation adhesive sheet 5
0 is provided between the back surface of the panel 11 and the heat sink 12.

[0005]

When the heat-dissipating pressure-sensitive adhesive sheet 50 is adhered to the heat-dissipating plate (initial rigid body) 12, the heat-dissipating pressure-sensitive adhesive sheet 50 may be bent or bent. The heat sink 12 is wound along the heat radiating plate 12 to prevent air from entering between the heat radiating plate 12 and the adhesive surface, and is further pressed and evacuated by a holding roll or the like, so that it can be completely adhered. However, when sticking to the back surface (the second rigid body) of the panel 11,
Because of the heat radiating plate 12, the heat radiating pressure-sensitive adhesive sheet 50 cannot be warped or pressed directly with a holding roll or the like. Therefore, the air A (see FIG. 16) easily enters between the back surface of the panel 11 and the adhesive surface adhered thereto, and further, it is not possible to sufficiently release the air. As a result, a sufficient adhesion area cannot be obtained, and a predetermined adhesion strength cannot be obtained.

In addition, when the temperature of the panel 11 rises, the air A that has entered expands, and the heat-radiating pressure-sensitive adhesive sheet 5
In addition to trying to separate the panel 0 and the panel 11 from each other, the air A acts as a heat-insulating portion, and inhibits heat radiation.

[0007] The present invention has been made in view of such circumstances, and it is difficult for air to enter between the adhesive surface of the heat-dissipating adhesive sheet and the panel or heat radiating plate attached thereto. It is an object of the present invention to provide a plasma display having a heat-radiating pressure-sensitive adhesive sheet capable of easily discharging air.

[0008]

In order to achieve the above object, a plasma display according to the present invention comprises a panel, a heat radiating plate, and a heat radiating pressure-sensitive adhesive sheet interposed therebetween. The heat-dissipating pressure-sensitive adhesive sheet is a heat-dissipating pressure-sensitive adhesive sheet comprising a heat-dissipating pressure-sensitive adhesive composition containing a pressure-sensitive adhesive and a heat conduction-imparting agent, and at least one of the front and back surfaces of the heat-dissipating pressure-sensitive adhesive sheet. Has a configuration in which a groove or a ridge is formed on the surface.

The present inventors have found that when a heat-radiating pressure-sensitive adhesive sheet is adhered to a rigid body (a panel, a heat radiating plate, or the like), air enters between the rigid body and the adhesive surface adhered to the rigid body. We thought that this was due to the poor flatness of the adhesive surface and the lack of its flexibility, and made extensive studies. However, it was found that, in the process, when the flatness and flexibility of the pressure-sensitive adhesive surface of the heat-radiating pressure-sensitive adhesive sheet were improved, air could easily enter the pressure-sensitive adhesive surface. It is considered that the reason for this is that the air in the central part pressed by the rigid body presses the adhesive surface to form a dent, and the air that cannot escape to the outside enters the dent. Therefore, I repeated my research from another angle.
As a result, when grooves or protrusions are formed on at least one of the front and back surfaces of the heat-radiating pressure-sensitive adhesive sheet, when the heat-radiating pressure-sensitive adhesive sheet is adhered to a rigid body, the heat-radiating pressure-sensitive adhesive sheet is not warped. Even if air does not easily enter between the rigid body and the adhesive surface on which the groove or ridge is adhered, even if it does, the air is forced into contact with the groove or ridge and the adhesive surface. The present inventors have found that they can be easily discharged into a space formed between them and can obtain a predetermined adhesion strength, and have reached the present invention.

Next, the plasma display of the present invention will be described in detail.

[0011] The plasma display of the present invention is provided with a heat-radiating pressure-sensitive adhesive sheet between the panel and the heat-radiating plate, and the heat-radiating pressure-sensitive adhesive sheet contains a heat-radiating pressure-sensitive adhesive containing a pressure-sensitive adhesive and a heat conduction-imparting agent. And a groove or a ridge is formed on at least one of the front and back surfaces thereof.

The cross-sectional shape of each part and each ridge sandwiched by the above-mentioned groove and each groove and each ridge sandwiched by the edge of the heat radiation adhesive sheet is not particularly limited. Flat ones, ones having a flat central portion surface, and ones whose heights gradually decrease as approaching the edges are exemplified.

The cross-sectional shape of the groove is not particularly limited, and may be concave, U-shaped, V-shaped, or the like. Further, the width of each groove is preferably set in a range of 0.2 to 2 mm, more preferably 0.5 to 1.5 mm.
mm. That is, the width of each groove is 0.2 mm
If it is less than, there is a possibility that the air that has entered between the rigid body and the adhesive surface to be adhered to the rigid body may not be sufficiently discharged into the groove, and if it exceeds 2 mm, the area of the adhesive surface becomes small, This is because there is a possibility that the adhesion strength of the resin may not be obtained. Furthermore, the width of each adhesive surface sandwiched between the grooves and each adhesive surface sandwiched between the grooves and the edge of the heat-radiating adhesive sheet is 2 to 15
It is preferably set in the range of mm, more preferably in the range of 3 to 10 mm. That is, when the width of each of the adhesive surfaces is less than 2 mm, the area of each of the adhesive surfaces is reduced, and a predetermined adhesion strength may not be obtained.
This is because if it exceeds 5 mm, air can easily enter between the rigid body and the adhesive surface adhered thereto.

The width of each ridge is preferably set in the range of 0.5 to 3 mm, more preferably,
It is in the range of 1 to 1.5 mm. That is, if the width of each ridge is less than 0.5 mm, the rigidity of the ridge is low, and the ridge is immediately collapsed, so that the air discharging effect is insufficient,
If it exceeds 3 mm, the contact area becomes small due to the stiffness of the ridge, and there is a possibility that sufficient adhesion strength may not be obtained. Furthermore, the width of each adhesive surface sandwiched between the ridges and each adhesive surface sandwiched between the ridge and the edge of the heat-dissipating adhesive sheet is 2 to 25.
It is preferably set to a range of 0 mm, more preferably, to a range of 30 to 150 mm. That is,
When the width of each of the adhesive surfaces is less than 2 mm, the area of each adhesive surface is reduced, and there is a possibility that a predetermined adhesion strength may not be obtained. This is because air can easily enter between.

The pressure-sensitive adhesive is not particularly limited as long as it can impart tackiness, and various types can be used. Above all, liquid adhesive resin is preferable in consideration of a method for producing a heat-dissipating adhesive sheet to be described later. Here, the liquid adhesive resin indicates a liquid at 25 ° C. and refers to an adhesive resin. In addition to the case where the properties of the resin itself are in a liquid state at 25 ° C., there are also included those which are solid at 25 ° C. and dissolved or dispersed in various organic solvents or water. Examples of such a liquid adhesive resin include resins such as urethane resins, acrylic resins, silicone resins, and epoxy resins, UV-curable resins,
EB curable resin, synthetic rubber, SEBS, SEP
Thermoplastic elastomers such as S, SBS and SIS; These may be used alone or in combination of two or more.

The thermal conductivity imparting agent used together with the above-mentioned pressure-sensitive adhesive is not particularly limited as long as it can impart thermal conductivity, and various types can be used.
Among them, ceramic powders such as aluminum nitride, silicon carbide, silicon nitride, boron nitride, and metal oxides (such as alumina), and metal powders such as iron and aluminum are preferable. In particular, alumina is preferred from the viewpoints of providing good thermal conductivity, versatility and cost. These may be used alone or in combination of two or more.

Further, the average particle size of the heat conduction imparting agent is as follows:
It is preferably set in the range of 0.5 to 150 μm, more preferably in the range of 5 to 100 μm. That is, when the average particle size is less than 0.5 μm, the viscosity of the liquid composition increases greatly, high filling cannot be performed, and a predetermined heat radiation property cannot be obtained. When the average particle size exceeds 150 μm, the surface of the liquid composition layer is not smooth, and causes adhesion inhibition. In addition,
The average particle size of the thermal conductivity imparting agent is a value derived using a sample arbitrarily extracted from the population. If the particle size is not determined uniformly, such as an elliptical sphere (a sphere with an elliptical cross section) instead of a true spherical shape, the simple average value of the longest and shortest diameters is calculated as the particle size of the particle. I do.

The amount of the heat conduction-imparting agent is 40 to 2 parts by weight per 100 parts by weight of the pressure-sensitive adhesive (hereinafter abbreviated as "part").
It is preferably set in the range of 30 parts, more preferably in the range of 65 to 150 parts. That is, if the amount of the heat conduction-imparting agent is less than 40 parts, the heat conductivity of the heat-radiating pressure-sensitive adhesive sheet as a whole may be insufficient.
If the amount exceeds 30 parts, good adhesiveness may not be obtained.

The heat-dissipating pressure-sensitive adhesive composition may appropriately contain an oil, an antioxidant, etc. in addition to the pressure-sensitive adhesive and the heat conduction-imparting agent.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the plasma display of the present invention. In this embodiment, the plasma display includes a panel (such as a glass panel) 11.
And a heat radiating plate (such as an aluminum chassis) 12, and a heat radiating adhesive sheet S interposed between the panel 11 and the heat radiating plate 12. And this heat radiation adhesive sheet S
Is obtained by solidifying a heat-radiating pressure-sensitive adhesive composition containing a pressure-sensitive adhesive and a heat conduction-imparting agent. As shown in FIG. 2, the front and back surfaces are formed on pressure-sensitive adhesive surfaces 1a and 1b, and A plurality (three in FIG. 2) of grooves 2 are formed in the same direction and are formed at equal intervals.

The heat-dissipating pressure-sensitive adhesive sheet S can be produced by the following casting method using the heat-dissipating pressure-sensitive adhesive composition. That is, first, the adhesive,
A heat conduction-imparting agent, if necessary, other additives, an organic solvent or water are mixed using a conventionally known mixer, and a heat-radiating pressure-sensitive adhesive composition liquid at 25 ° C. (hereinafter referred to as “liquid composition”) Is prepared.

Next, as shown in FIG. 3, a mold film (a metal mold) which continuously runs endlessly and has on its surface ridges corresponding to the grooves 2 (see FIG. 2) of the heat-radiating pressure-sensitive adhesive sheet S is formed. The above liquid composition 3 is formed on the surface of F prepared by press molding).
Is supplied from the supply nozzle 4. Liquid composition 3 supplied
The unnecessary portion is removed by the doctor knife 5 in which the gap with the mold film F is adjusted.
The liquid composition layer 6 having a uniform thickness is formed.

Subsequently, the formed liquid composition layer 6 is hardened (solidified) by passing it through the tunnel furnace 7 together with the mold film F. The solidified material is the heat-radiating pressure-sensitive adhesive sheet S, and the groove 2 (see FIG. 2) is formed on the lower surface of the heat-radiating pressure-sensitive adhesive sheet S in FIG.
The tunnel furnace 7 is generally provided with a far-infrared heater on all the inner walls thereof in order to uniformize the solidification of the liquid composition layer 6.
An ultraviolet irradiator, an electron beam irradiator, and the like are provided so that heat, ultraviolet rays, electron beams, and the like can be applied to the liquid composition layer 6 from all directions.

Subsequently, the formed heat-radiating pressure-sensitive adhesive sheet S is released from the mold film F, and is continuously taken up on a take-up drum 10 together with the separator 9 fed out from the separator supply roll 8 to form a roll. Make a wound body.

Then, as shown in FIGS. 4 and 5, the heat radiating pressure-sensitive adhesive sheet S is attached to the back surface of the panel 11 and the heat radiating plate 1.
2 is provided in the same manner as in the related art, but when the heat-dissipating pressure-sensitive adhesive sheet S with a belt-like separator is pulled out from the above-mentioned wound body, the separator 9 (see FIG. 3) is used. Is attached to the adhesive surface 1a on which the groove 2 is formed, and the adhesive surface 1a on which the groove 2 is formed is attached to the back surface (second rigid body) of the panel 11. Further, it is preferable that the sticking is performed such that the length direction of the groove 2 is the vertical direction.

In this case, since the groove 2 is formed on the adhesive surface 1a attached to the back surface of the panel 11, the adhesive surface 1 and the groove 2 sandwiched by the groove 2 and the heat radiation adhesive The width of the adhesive surface 1a sandwiched between the edge of the agent sheet S is reduced,
It is difficult for air to enter between the back surface of the panel 11 and the adhesive surface 1a. Furthermore, even if air enters during this time, the air is easily discharged into the groove 2 by pressing from above the radiator plate 12. As a result, a sufficient adhesion area can be obtained, and a predetermined adhesion strength can be obtained. Moreover, even if the temperature of the panel 11 or the like rises, there is no air that enters the space, so that the heat radiation adhesive sheet S is not separated from the panel 11 or the heat radiation is not hindered.

Further, when the heat radiating pressure-sensitive adhesive sheet S is adhered so that the length direction of the groove 2 is vertical, when the temperature of the panel 11 or the like rises, the heated air is released. 2
, And cool air flows into the groove 2 from below, thereby promoting the heat radiation effect.

Further, the heat-radiating pressure-sensitive adhesive sheet S can be produced as follows, in addition to the above-mentioned method. That is, first, after preparing the same liquid composition as described above, as shown in FIG. 6, the separator 9 is fed from the separator supply roll 8 and stretched between the forming drum 13 and the winding drum 10. It is fed out continuously in the horizontal direction as it is.

On the other hand, the liquid composition 3 is supplied from the supply nozzle 4 to the upper surface of the separator 9. Unnecessary portions of the supplied liquid composition 3 are removed by a doctor knife 5 whose gap with the separator 9 is adjusted, and a liquid composition layer 6 having a uniform thickness is formed on the upper surface of the separator 9.

Subsequently, the liquid composition layer 6 thus formed is hardened by passing it through the tunnel furnace 7 together with the separator 9. That the hardened is heat radiation adhesive sheet base S _1. And the groove 2 of the heat radiation adhesive sheet S
Ridge has a rotary press die M which is formed on a press surface corresponding to (see FIG. 2), the grooves 2 the upper surface of the heat radiation adhesive sheet base S ₁ was pressed (see FIG. 2) By forming it on the upper surface, the heat-radiating pressure-sensitive adhesive sheet S is obtained.

Subsequently, the obtained heat-radiating pressure-sensitive adhesive sheet S
Is continuously wound with the separator 9
Into a roll. Even in this manner, the heat-radiating pressure-sensitive adhesive sheet S can be manufactured.

FIG. 7 shows another embodiment of the plasma display of the present invention. In this embodiment, as the heat-radiating pressure-sensitive adhesive sheet T, one having a plurality of (three in FIG. 8) ridges 15 formed on the surface thereof at equal intervals in the same direction as shown in FIG. 8 is used. ing. As shown in FIG. 7, the heat-radiating pressure-sensitive adhesive sheet T has a surface of each portion sandwiched between the ridges 15 and a surface of each portion sandwiched between the ridge 15 and the edge of the heat-radiating pressure-sensitive adhesive sheet T. And ridge 1
5 becomes the adhesive surfaces 1a and 15a (see FIG. 8),
It is pressed and deformed and adhered to the back surface of the panel 11. The other parts are the same as those of the above embodiment, and the same parts are denoted by the same reference numerals.

In this case, the mold film F (see FIG. 3)
And the press surface of the press mold M (see FIG. 6) is provided with grooves corresponding to the ridges 15, and the heat-radiating pressure-sensitive adhesive sheet T is used in the same manner as in the above embodiment.
Can be manufactured.

When such a heat-radiating pressure-sensitive adhesive sheet T is used, when the heat-radiating pressure-sensitive adhesive sheet T is adhered to the back surface of the panel 11, it is pressed from above the heat-radiating plate 12, so that the ridge 15 and the surface of the heat-radiating pressure-sensitive adhesive sheet T are pressed. 16 formed between the adhesive surface 1a
Then, the air on the adhesive surfaces 1a and 15a is discharged. And the same operation | movement and effect as the above-mentioned embodiment can be exhibited.

FIG. 9 shows still another embodiment of the plasma display of the present invention. In this embodiment, as the heat-radiating pressure-sensitive adhesive sheet U, one having a plurality of (three in FIG. 10) thread-like bodies 17 laid on the surface in the same direction at equal intervals as shown in FIG. 10 is used. ing.
Then, as shown in FIG. 9, the surface of each portion sandwiched between the filaments 17 and the surface of each portion sandwiched between the filament 17 and the edge of the heat-radiating pressure-sensitive adhesive sheet U become the adhesive surface 1 a, and 11 is pressed and deformed and adhered to the back surface of the substrate 11. The other parts are the same as those of the above embodiment, and the same parts are denoted by the same reference numerals.

In this case, the heat radiation adhesive sheet U can be manufactured by laying the thread 17 on the surface of the conventional heat radiation adhesive sheet 50 (see FIG. 16).

Even when such a heat-dissipating pressure-sensitive adhesive sheet U is used, when the heat-dissipating pressure-sensitive adhesive sheet U is pressed from above the heat-dissipating plate 12 when the heat-dissipating pressure-sensitive adhesive sheet U is adhered to the rear surface of the panel 11, Space 18 formed between the surface and the adhesive surface 1a
Then, the air on each adhesive surface 1a is discharged. And the same operation | movement and effect as the above-mentioned embodiment can be exhibited.

Next, examples will be described together with comparative examples.

[0040]

Examples 1 to 3 A heat-radiating pressure-sensitive adhesive composition (liquid composition) having the following composition was prepared, and by using the apparatus shown in FIG. Groove 2
Three kinds of heat-radiating pressure-sensitive adhesive sheets S having different widths of the pressure-sensitive adhesive surfaces sandwiched between the sheets (see FIG. 2) were produced. In each of the heat-radiating pressure-sensitive adhesive sheets S, the groove 2 has a concave cross-sectional shape, a depth of 0.5 mm, and all are long in the same direction.

[Blending composition] Urethane-based resin 100 parts (Hyprene P306, polyol EP240, manufactured by Mitsui Chemicals, Inc.) Catalyst (lead octylate, manufactured by Nippon Chemical Industry Co., Ltd.) 0.3 parts Thermal conductivity imparting agent 80 parts (alumina AS- 30, manufactured by Showa Denko KK, content ratio of particles having an average particle diameter of 16 μm and a particle diameter of 5 μm or less 20% by weight) Stabilizer (Noxeller TTCU, manufactured by Ouchi Shinko Chemical Co., Ltd.) 1 part

[0042]

Examples 4 and 5 Further, a heat-radiating pressure-sensitive adhesive composition (liquid composition) having the composition shown above was prepared, and the shape of the ridge of the mold film F was changed by using the apparatus shown in FIG. Then, two types of heat-radiating pressure-sensitive adhesive sheets S having different cross-sectional shapes at portions sandwiched between the grooves 2 (see FIG. 2) were produced. A cross section having a kamaboko shape (see FIG. 11) is referred to as a fourth embodiment.
A trapezoidal one (see FIG. 12) was used as Example 5. Also,
In any of the heat-radiating pressure-sensitive adhesive sheets S, the groove 2 has a depth of 0.5 mm, and all of the grooves 2 are formed to be long in the same direction.

[0043]

Examples 6 to 8 Further, a heat-radiating pressure-sensitive adhesive composition (liquid composition) having the above-mentioned composition was prepared, and the interval between the grooves of the mold film F was changed by using the apparatus shown in FIG. Then, three types of heat-radiating pressure-sensitive adhesive sheets T having different widths of the pressure-sensitive adhesive surface 1a sandwiched between the ridges 15 (see FIG. 8) were produced. In each of the heat-radiating pressure-sensitive adhesive sheets T, the ridge 15 has a flat surface, a height of 1.0 mm, and a length that is long in the same direction.

[0044]

Examples 9 and 10 Further, a heat-radiating pressure-sensitive adhesive composition (liquid composition) having the above-mentioned composition was prepared, and the shape of the groove of the mold film F was changed using the apparatus shown in FIG. ,
Two types of heat-radiating pressure-sensitive adhesive sheets T having different ridges 15 (see FIG. 8) in cross-sectional shape were produced. And, the cross-sectional shape was a trapezoidal shape (see FIG. 13) as Example 9, and the trapezoidal shape (see FIG. 14) as Example 10. In each of the heat-radiating pressure-sensitive adhesive sheets T, the ridge 15 has a height of 1.
0 mm, all of which are formed long in the same direction.

[0045]

Examples 11 and 12 Further, a heat-radiating pressure-sensitive adhesive composition (liquid composition) having the composition shown above and a separator were prepared, and the liquid composition was applied on the separator and simultaneously solidified by heating (at 100 ° C.). 10 minutes) to produce a heat-radiating pressure-sensitive adhesive sheet with a separator. Next, the separator is peeled off, and the thread 1
7 were laid in parallel to produce two types of heat-radiating pressure-sensitive adhesive sheets U (see FIG. 10). And as the above-mentioned filament 17
A fishing line using a circular fishing line (thickness: 1 mm) was used in Example 11, and a fishing line using a cotton twisted line (thickness: 1 mm) was used in Example 12.

[0046]

COMPARATIVE EXAMPLE 1 A heat-radiating pressure-sensitive adhesive composition (liquid composition) having the above composition and a separator were prepared, and the liquid composition was applied on the separator and simultaneously solidified by heating (1 ° C. at 100 ° C.).
0 minutes) to produce a heat-radiating pressure-sensitive adhesive sheet with a separator. That is, this is a conventional heat-radiating pressure-sensitive adhesive sheet 50 (see FIG. 16), in which no grooves are formed on both front and back surfaces.

For each of the heat-radiating pressure-sensitive adhesive sheets thus obtained, the actual adhesion rate of the adhesive surface was calculated according to the following method.
Those less than that were evaluated as x.

[Actual Adhesion Rate] As shown in FIG. 15, a heat-radiating pressure-sensitive adhesive sheet S, T, U, 50
Respectively, and the heat radiation adhesive sheets S, T,
A glass plate 31 was further adhered to the other surface of U and 50. At this time, regarding the heat-radiating pressure-sensitive adhesive sheets S and U of Examples 1 to 5, 11, and 12, the grooves 2, the filaments 17 (see FIG. 10)
The glass plate 31 is adhered to the adhesive surface 1a (see FIGS. 2 and 10) on which the ridges 15 are formed (see FIG. 8). The glass plate 31 was attached to the adhesive surface 1a (see FIG. 8) and the adhesive surface 15a (see FIG. 8) on the surface of the ridge 15. And the heat radiation adhesive sheet S, T, U,
The actual attachment ratio of the 50 to the glass plate 31 was measured. This measurement was performed by three persons visually estimating each. Then, an average value of these three values was taken, and this average value was shown in Tables 1 and 2 below as the actual arrival rate. The actual attachment rate is defined as the pressure-sensitive adhesive surface which should originally be completely adhered to the glass plate 31 [Examples 1 to 5 except for the groove 2, and Examples 6 to 10 refer to the space 16 (see FIG. 7). In Examples 11 and 12 except for the portion corresponding to ()), the filament 17
And the area (excluding the portion corresponding to the space 18 (see FIG. 9))] (the value calculated by calculation).

[0049]

[Table 1]

[0050]

[Table 2]

From the results shown in Tables 1 and 2, from Example 1
The improvement of the actual attachment rate can be confirmed for the products to 12 products as compared to the product of Comparative Example 1.

In the above embodiment, the grooves 2, the ridges 15, and the filaments 17 are formed to be long in the same direction. However, the present invention is not limited to this. May be formed in two or more different directions. In particular, when the ridges 15 are crossed in a grid or the like, a portion surrounded by the ridges 15 is formed. When the filaments 17 are used in a lattice pattern or the like, a portion surrounded by the filaments 17 is formed. Therefore, it is preferable to use a twisted yarn as the filament 17. The reason for this is to allow air to pass through a slight gap in the twisted yarn. In addition, the filament 1
A mesh may be used instead of 7, but since the mesh of the mesh is a portion surrounded by the mesh, it is preferable to use a twisted yarn for the material of the mesh for the same reason. Further, the intervals between the adjacent grooves 2, the protrusions 15, and the filaments 17 are not limited to equal intervals.

In the above embodiment, the grooves 2, the ridges 15, and the filaments 17 are formed only on the front surface of the heat-radiating pressure-sensitive adhesive sheets S, T, U, but they may also be formed on the back surface. . Then, the groove 2 or the ridge 15 is connected to the heat radiation adhesive sheet S,
When forming also on the back surface of T, in the manufacturing method shown in FIG. 3, a similar mold film F is separately prepared, and the surface of the mold film F is brought into contact with the upper surface of the liquid composition layer 6, or Alternatively, in the manufacturing method shown in FIG.
After the liquid composition layer 6 is hardened by passing through the inside, it is pressed by a press mold M shown in FIG. 6 to form the groove 2 or the ridge 15 on the upper surface, or as shown in FIG. In the manufacturing method, the press mold M is used to release the heat-radiating pressure-sensitive adhesive sheet substrate S ₁
Can be a vertically disposed, prepared by either the like so as to form a Jomizo 2 or ridges 15 on its upper and lower surfaces of the upper and lower surfaces of the heat radiation adhesive sheet base S ₁ is pressed.

Each portion sandwiched between the grooves 2 and each portion sandwiched between the grooves 2 and the edge of the heat-radiating pressure-sensitive adhesive sheet S and the ridge 15 gradually increase in height as approaching the edge. It may be lower. In the above embodiment, such heat-radiating pressure-sensitive adhesive sheets S and T are manufactured by forming the surface of the mold film F and the press surface of the press mold M used in the manufacture into shapes corresponding to the above-described respective portions. can do. And if each part is made as described above, air can be easily discharged from the flat adhesive surfaces 1a and 15a, and the width of each part can be increased.

Further, in order to increase the adhesion strength between the panel 11 and the heat-radiating pressure-sensitive adhesive sheets S, T, U, a silicone-based surface treatment agent (primer) is applied to the pressure-sensitive adhesive surfaces 1a, 15a as required. May be.

[0056]

As described above, the plasma display of the present invention is a plasma display comprising a panel, a heat radiating plate, and a heat radiating pressure-sensitive adhesive sheet interposed therebetween. The heat-dissipating pressure-sensitive adhesive sheet is a heat-dissipating pressure-sensitive adhesive sheet comprising a heat-dissipating pressure-sensitive adhesive composition containing a pressure-sensitive adhesive and a heat conduction-imparting agent, and at least one of the front and rear surfaces of the heat-dissipating pressure-sensitive adhesive sheet has grooves or protrusions. Articles are formed. Therefore, when the heat-dissipating pressure-sensitive adhesive sheet is attached to a panel or a heatsink, air is unlikely to enter the adhesive surface on which the grooves or protrusions are formed. It can be easily discharged into the space formed between the ridge and the adhesive surface, and a predetermined adhesion strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a plasma display of the present invention.

FIG. 2 is a perspective view showing a heat-radiating pressure-sensitive adhesive sheet used for the plasma display.

FIG. 3 is a schematic explanatory view for explaining an example of a method for producing the heat-radiating pressure-sensitive adhesive sheet.

FIG. 4 is a plan view showing the plasma display.

FIG. 5 is a cross-sectional view showing the plasma display.

FIG. 6 is a schematic explanatory view for explaining another example of the method for producing the heat-radiating pressure-sensitive adhesive sheet.

FIG. 7 is a plan view showing another embodiment of the plasma display of the present invention.

FIG. 8 is a perspective view showing a heat-radiating pressure-sensitive adhesive sheet used for the plasma display.

FIG. 9 is a plan view showing still another embodiment of the plasma display of the present invention.

FIG. 10 is a perspective view showing a heat-radiating pressure-sensitive adhesive sheet used for the plasma display.

FIG. 11 is a cross-sectional view showing a heat-radiating pressure-sensitive adhesive sheet of Example 4.

FIG. 12 is a sectional view showing a heat-radiating pressure-sensitive adhesive sheet of Example 5.

FIG. 13 is a sectional view showing a heat-radiating pressure-sensitive adhesive sheet of Example 9.

FIG. 14 is a sectional view showing a heat-dissipating pressure-sensitive adhesive sheet of Example 10.

FIG. 15 is a schematic explanatory diagram for explaining measurement of the actual arrival rate.

FIG. 16 is a sectional view showing a conventional plasma display.

FIG. 17 is an explanatory view showing a method of attaching a heat-radiating pressure-sensitive adhesive sheet to an initial rigid body.

[Explanation of symbols]

 S heat radiation adhesive sheet 2 groove 11 panel 12 heat radiation plate

Continued on the front page (72) Inventor Kiyoaki Kamiya 3-1, Higashi 3-chome, Komaki City, Aichi Prefecture Inside (72) Masahiko Takahashi 2- 10-12 Iwamotocho, Chiyoda-ku, Tokyo Mochida Shoko Co., Ltd. F term (reference) 4F205 AB01 AH42 GA07 GB02 GB29 GC07 GF03 GN10 GN11 GN28 GN29 4J004 AA02 AA05 AA07 AA10 AA11 AA13 AA14 AA18 CC05 CE03 FA05 FA10

Claims (12)

[Claims] 1. A plasma display comprising a panel, a heat radiating plate, and a heat radiating pressure-sensitive adhesive sheet interposed therebetween, wherein the heat radiating pressure-sensitive adhesive sheet comprises an adhesive, a heat conduction imparting agent, A heat-dissipating pressure-sensitive adhesive sheet comprising a heat-dissipating pressure-sensitive adhesive composition containing, wherein a groove or a protrusion is formed on at least one of the front and back surfaces of the heat-dissipating pressure-sensitive adhesive sheet. display. 2. The width of each groove of the heat-radiating pressure-sensitive adhesive sheet is 0.
2 to 2 mm, the width of each adhesive surface sandwiched by the groove and the width of each adhesive surface sandwiched by the groove and the edge of the heat-radiating adhesive sheet is 2 to 2 mm.
2. The plasma display according to claim 1, wherein the distance is in a range of 15 mm. 3. The plasma display according to claim 1, wherein all grooves of the heat-radiating pressure-sensitive adhesive sheet are formed to be long in the same direction. 4. The plasma display according to claim 1, wherein the grooves of the heat-radiating pressure-sensitive adhesive sheet are elongated in two or more different directions. 5. A central surface of each portion sandwiched between the grooves of the heat-dissipating adhesive sheet and a central portion of each portion sandwiched between the grooves and the edge of the heat-dissipating adhesive sheet is a flat adhesive surface. ~
5. The plasma display according to any one of 4. 6. A central surface of each part sandwiched between the grooves of the heat-dissipating adhesive sheet and each part sandwiched between the grooves and the edge of the heat-dissipating adhesive sheet is an adhesive surface. The plasma display according to any one of claims 1 to 4, wherein the outer height gradually decreases as approaching the edge. 7. The width of each ridge of the heat-radiating pressure-sensitive adhesive sheet is 0.
The plasma display according to claim 1, wherein the width of each adhesive surface sandwiched between the ridges and the width of each adhesive surface sandwiched between the ridges and the edge of the heat-radiating adhesive sheet is within a range of 2 to 250 mm. . 8. The plasma display according to claim 1, wherein all the ridges of the heat-radiating pressure-sensitive adhesive sheet are formed to be long in the same direction. 9. The plasma display according to claim 1, wherein the ridges of the heat-radiating pressure-sensitive adhesive sheet are elongated in two or more different directions. 10. The plasma display according to claim 1, wherein the surface of each ridge of the heat-radiating pressure-sensitive adhesive sheet is flat. 11. The plasma display according to claim 1, wherein a central surface of each ridge of the heat-radiating pressure-sensitive adhesive sheet is flat. 12. The radiating pressure-sensitive adhesive sheet according to claim 1, wherein the height of each ridge gradually decreases as approaching the edge.
The plasma display according to any one of claims 7 to 9.